The maximum wind speeds of tornadoes
are not expected to reach the F6 wind speeds.

Whose scale is it?The Fujita-Pearson Scale or The Fujita
Scale?The scale was original created in 1971 by Dr. Fujita as a way of determining
the strength of tornadoes from the damage that they caused. Like
many of the contributions of Dr. Fujita, it was not widely accepted when first published.

Dr. Fujita and Dr. Pearson two years later published a paper that added
in factors related to the width and length of the tornado path, and called
the scale the Fujita-Pearson Scale. It was this work that caused
the scale to gain acceptance.

The Storm Prediction Center now uses the greatly improved Fujita Scale
to determine tornado strength from the damage that the tornado causes
after the tornado.

Yet when a spotter or anyone else from the field makes a judgment about
the size of a tornado without damage data, but on the width and length of the tornado path,
they are making that judgment
based on the size of the tornado on the ground, which is the Pearson method.